Joe Scott of Reply with Joe explores the history of deep sea recording, including The Bloop. It is known as the loudest underwater sound which have been recorded and captured by hydrophones installed around the Pacific.
"The ocean is wide, vast, and terrifying. But for the last 40 years, researchers around the world have been recording audio from hydrophones to try to understand it better. And we’ve learned a lot. But a surprising number of sounds have been recorded that defy explanation."
Bloop, the iconic ultra-low frequency, high amplitude sound, was recorded in 1997 and went undetected for many years, leading to a multitude of conspiracies. It was finally resolved in 2005. The mysterious recording turned out not to be a gigantic deep-sea fantasy creature, but the sound of an ice tremor.
"They finally discovered The Bloop source. it was the sound of an Ice Quake which is an iceberg cracking and breaking away from the Antarctic Glacier kind of anticlimactic of course, you know, when you think about it or more frightening if you’re concerned about climate change. The Bloop is not the only mysterious sea sound that we’ve recorded. There are actually several unexplained sounds from the ocean that we still don’t know what’s making them."